Friday

July 29, 2016
Total # Posts: 3,442

**chemistry**

A 100.0 ml sample of 0.300 M NaOH is mixed with a 100.0 ml sample of 0.300 M HNO3 in a coffee cup calorimeter. Both solutions were initially at 35.0 degrees celcius; the temperature of the resulting solution was recorded at 37.0 degrees celcius. Determine the delta H (in units...
*July 12, 2012*

**history**

Which country lawyer from Ashtabula, Ohio, argued that criminals are not born, but are made by the unjust condition of human life?
*July 9, 2012*

**stastics**

If 1.5% of the bolts made by an automotive factory are defective, what is the probability that in a shipment of 200 bolts, there are 6 defective bolts? Place your answer, rounded to four decimal places, in the blank.
*July 8, 2012*

**Chemistry**

I was just having trouble with getting the [OH-] concentration. I had the answer just didn't know how to get to it. Thank you, it helped.
*July 8, 2012*

**Chemistry**

This question was posted: At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.56. What is the Ksp of the compound at 22 °C? I have found my [OH-] concentration (3.63x10^-4) but I am ...
*July 8, 2012*

**math**

Given a dilation with the origin O (0, 0), by observation determine the scale factor "k." DO,K = (6, 12) (3, 6) What is the scale factor K = a0 Is the dilation an expansion or contraction? a1
*June 28, 2012*

**Beginner Alegra**

That was sooo much easier than I was making it out to be. Thank you!
*June 17, 2012*

**College Algebra**

Algebra! Not Alegra.
*June 17, 2012*

**Beginner Alegra**

From a point on a straight road, Nico and Maria are riding bicycles in the same direction. Nico rides at 12mph and Maria rides at 14mph. In how many hours will they be 11 mi apart?
*June 17, 2012*

**Physics**

A block of mass 77.0kg is placed at the top of a frictionless plane that is inclined 46 degrees to the horizontal. The height of the plane is 23.0 meters. Find the speed of the block at the bottom of the plane. Please show all your steps, don't just suggest a formula. ...
*June 11, 2012*

**Physics**

Fabulous! Thank you!!!
*June 11, 2012*

**Physics**

Question though, the answer in the book says that the answer is 3.9 Newtons...do I need to convert this answer or something?
*June 11, 2012*

**Physics**

Find the magnitude of the gravitational attraction force that the earth exerts on a 62-kilogram astronaut who is 8.00 X 10^7 meters away from the center of the earth. Useful numbers: M^earth=5.98 X 10^24kg; G=6.67 X 10^-11 N*m^2kg^-2 Please walk me through your steps, don'...
*June 11, 2012*

**Physics**

The liquid in the tube has a density of 1.48 g/cm^3 . The atmospheric pressure is 1.013 X 10^5 newtons per square meter. What is the pressure P in the container? Please walk me through your steps, don't just suggest a formula. Thank you very much.
*June 11, 2012*

**Physics**

I know it IS really fast lol, but that's what is says! Thank you for your help!
*June 11, 2012*

**Physics**

A wheel is rolling ithout slipping at 487 meters per second to the right on a level surface. the diameter of the wheel is 100 centimeters. What is the angular speed of the wheel in revolutions per minute? Please walk me through your steps, don't just suggest a formula. ...
*June 11, 2012*

**Physics**

Thank you so much!!
*June 11, 2012*

**Physics**

A particle moved along the x axis with a constant acceleration of -85.0 meters per second squared. The initial position of the particle was at the origin and its initial velocity was +325 meters per second. Find the position of the particle at T=4.0 seconds. Please walk ...
*June 11, 2012*

**Physics**

Oh my goodness, thank you so much! I was trying to do so much more then I needed too!
*June 11, 2012*

**Physics**

A car slowed down at a constant rate from 32meters per second to 3.0 meters per second in 9.0 seconds. What was the distance the car traveled in 9.00 seconds? Please show all steps, thank you very much.
*June 11, 2012*

**chemistry**

When you add 100ml of a 0.1M HCl solution to 200 ml of 0.4M NaOH solution what is the pH? can you please show detailed work. o dont understand this
*June 8, 2012*

**algebra**

if a wall is 34 feet, how tall must a ladder be to reach the top if at a 75 degree angle
*June 5, 2012*

**chemistry**

if 7.50g of Na2CO3 reacts, how many moles of CO2 are produced?
*May 28, 2012*

**algebra**

if lisa studies for 9 hours and gets a score of 75. How long would she have to study to get a score of 94
*May 26, 2012*

**physics..**

what's the density of a box whose weight is 1648 newtons and whose volume is 2.8 cubic meters? Will it float in a liquid whose density is 600 kilograms per cubic meter?
*May 24, 2012*

**physics**

if the pulleys are massless and frictionless and the rope is of negligible mass, and aristotle wanted to raise the 332 newton weight to a height of 6 meters. A-find the magnitude of force F he needed to pull on the rope to move the weight upward with a constant velocity. B-...
*May 24, 2012*

**physics**

the supports are on each end and the weight is in the middle
*May 24, 2012*

**physics**

A weightless beam rests on two supports. The beam supports a weight of 120 newtons. What are the magnitudes of the forces on each end ( A & B) of the beam?
*May 24, 2012*

**physics**

again-set up?
*May 24, 2012*

**physics**

A female whose mass is 130 kilograms is standing on a scale in an elevator that has an initial downward velocity of 6 meters per second and is accelerating upward at 7 meters per second. What's the magnitude of the apparent weight indicated by the scale?
*May 24, 2012*

**physics**

I'm confused as how you'd set these up..
*May 24, 2012*

**physics**

Trenton struggled as he lifted a 27kg mass vertically a distance of 9 meters in 4minutes with a constant velocity. A-how much work did he do? B-What was the average power comsumption in watts?
*May 24, 2012*

**physics**

Forces of 1,5,3, and F newtons are applied to a weightless board that rests on a fulcrum. The board doesn't rotate-what's the magnitude of the force F?
*May 24, 2012*

**physics**

a 1462 kilogram block was lifeted vertically at a constant velocity a distance of 0.08 x 10(to the 6th power) meters in 5minutes. A-how much work was done? B-what was the average power consumption in watts?
*May 24, 2012*

**physics**

not helpful..
*May 24, 2012*

**physics**

Three forces are applied to a box wrench. find the total torque about the bolt in newton-meters caused by these forces. Is the torque a positive torque or a negative torque?
*May 24, 2012*

**physics**

wonderful, ty
*May 24, 2012*

**physics**

The density of an unspecified material is 3.27 g/cm (cubed) . if the mass of a block of this material is 10.9kg, what is the volume of the block in cubic meters? A Wooden block is pulled to the right across a level surface at a constant velocity by a force of 47 Newtons, the ...
*May 24, 2012*

**physics**

How do you find the total mass of two objects that weigh 111 newtons and 218 newtons?
*May 24, 2012*

**physics**

Awsome thank you. Now I've been trying to figure out how far he traveled but my equation keeps giving me the wrong answer. How would I figure this out?
*May 24, 2012*

**physics**

Galois drove 40kilometers due west in 9hours and then drove 62kilometers due north in 5 hours. What was his dispacement? What was his average velocity?
*May 24, 2012*

**physics**

great, ty
*May 24, 2012*

**physics**

how do you convert 558 kelvins to degrees Celsius?
*May 24, 2012*

**physics**

an object moving in the positive x direction went from a velocity of 2.5 km/s to a velocity of 8.0 km/s in 6.2seconds. what was the object's average acceleration?
*May 24, 2012*

**Physics**

a truck is traveling in a straight line goes 60km in 83minutes. what is its average speed in km per hour?
*May 24, 2012*

**physics **

A Block has a mass of 50.0 kilograms. the coefficient of static friction between the block and the level floor on which it rests is 0.428 A horizontal force of 618 newtons is applied to the block to the right, as shown. will the block move?
*May 24, 2012*

**physics**

The weight of the block is 84Newtons
*May 24, 2012*

**physics**

A block is pulled to the right across a alevel surface at a constant velocity of a horizontal force of 16 newtons. what is the coefficient of kinetic friction between the block and the surface?
*May 24, 2012*

**Physics**

An object moving in the positive x direction went from a velocity of 2.5 km/s to a velocity of 8.0 km/s in 6.2 seconds. What's the object's average acceleration?
*May 24, 2012*

**SCIENCE (GENETICS)**

if there are two forms of each of the seven traits, how many possible combinations are there?
*May 23, 2012*

**physics **

For long range communication an elephant uses a low frequency rumble that is undetectable to human ears. One elephant can pick up another elephant's call from a distance of 10 km. The frequency of this rumble is about 13 Hz. How fast does the rumble travel?
*May 22, 2012*

**physics**

after a golf ball is hit it takes off with an initial speed of 23.4 m/s and at an angle of 43.0 with respect to the horizontal the gold field is flat and horizontal. neglecting air resistence how far will the ball fly
*May 22, 2012*

**chemistry**

The rate constant, k, for each reaction order is equal to _____ from the linear plot. Reaction Order Answer zero:___ first: ___ second: ___ a. slope (m) b. y-intercept c. x-intercept d. negative of the slope (-m) e. 0
*May 10, 2012*

**Chem**

I need help please! You have been given 40ml of a 0.6M solution of NaCl and 40ml of a 0.1M solution of KCl. You are also given as much diluent as you need. Show all your work and indicate how you would make 40ml of a single solution that contains 0.005M NaCl and 0.025M KCl.
*May 7, 2012*

**Math - patterns**

what's the pattern for 2,3,__, 7, 11, 13, 17
*May 4, 2012*

**physics**

a book having a mass of 1.3kg lies on a shelf 1.8 m above the floors in a room whose ceiling is 2.5 m high. What is the books gravitational energy relative to the floor?
*April 29, 2012*

**chemistry**

A 115 mL sample of a 10.0 M ethylene glycol (C2H6O2) solution is diluted to 1.30 L. What is the freezing point of the final solution? (Assume a density of 1.06 g/mL for the final solution.) What is the boiling point of the final solution? How would I go about setting this up? ...
*April 29, 2012*

**math**

Seek power series solution of the given differential equation about the given point x0; find the recurrence relation. (1-x)y'' + y = 0; x0 = 0
*April 21, 2012*

**physics**

Amy is 160 cm tall and stands 50 cm in front of a plane mirror. The image of Amy is:
*April 17, 2012*

**science**

Does adding boiled, deionized water to the titrating flask to wash the wall of the erlenmeyer flask and the buret tip increase, decrease, or have no effect on the Ksp value of the Ca(OH)2?
*April 17, 2012*

**Statistics**

Alonzo applied for a job to be an administrative assistant.He had to take a typing test. His words per minute were translated into a z-score. If the z-score was 0, should he be hired? There were 47 applicants, and typing speed is very important.
*April 8, 2012*

**Chemistry**

How did you find the concentration of [OH-]
*April 1, 2012*

**chemistry**

A dynamic equilibrium, Ag2CO3(s) <=> 2Ag+(ag) , CO3 2- (ag), what affect does the addition af HCl have on the system? Does it cause a shift?
*March 19, 2012*

**CHEMISTRY**

No problem! Thanks! :)
*March 18, 2012*

**CHEMISTRY**

Okay thanks sooooo much! I really really really appreciate your help! It's fine everyone makes mistakes! :)
*March 18, 2012*

**CHEMISTRY**

But Kf= 1.86 degrees C/m not 0.186? So shouldn't it be : dT = 1*1.86*14.46 =26.97 ---> -26.97
*March 18, 2012*

**CHEMISTRY**

What did you get for part b if you disagree with -26?
*March 18, 2012*

**CHEMISTRY**

oohhh so for part d I mixed up molarity and molality my bad...I get it now! So the answer I got in part a is supposed to be used in part d......Thanks! :)
*March 18, 2012*

**CHEMISTRY**

what did you get for part b then?
*March 18, 2012*

**CHEMISTRY**

sorry I typed it wrong....my answer for a) is 14.5 M
*March 18, 2012*

**CHEMISTRY**

for part c: 100g* 1L/920 g= .108695 L M=mols/L 0.87 mols of H2O/.108695 L =8.004 M Is this right? part d: pi= (8.004M) (0.08206) (-26.97+273)= 161.59 atm is this right?
*March 18, 2012*

**CHEMISTRY**

You mix 40.0 g of ethanol (C2H5OH, molecular weight = 46.1 g/mol) and 60.0 g of water (molecular weight = 18.0 g/mol) The resulting solution has a density of 920 g/L. a)Calculate the molarity of ethanol in this solution? Answer : 0.06 kg of H2O This is correct. b) At what ...
*March 18, 2012*

**Social studies **

Which of the following accurately describes a surplus? Consumer demand for a certain car is below the number of cars that are produced. The production costs for a certain car are below the sale price of that car. A car company tries to charge too high a price for a car and has...
*March 13, 2012*

**Math**

Thank you!
*March 8, 2012*

**Math**

Lily and Tina went to dinner. When the bill came, Lily discovered that she had only $6. Luckily, Tina had enough money to pay the rest or 3/5 of the bill. How much did Tina pay? How much was the total bill?
*March 8, 2012*

**Chem 100**

If the initial volume is 150mL and the final volume is 1L, what is the final pressure?
*March 1, 2012*

**English**

"Christina Nehring makes allusions to classical myths and 18th and 19th century writers in her essay "Fideltiy with a Wandering Eye". How do these allusions support her argument about women and sex? ALSO How effective are these allusions"
*February 29, 2012*

**math**

64 000 000 Square Millimeter Standard Form: 6.4 x 10 to the 6th power
*February 28, 2012*

**math grade 6**

Thanks fo the answer Cassie "18 chairs and six stools" Can you show me the working please. "a carpainter made 20 pieces of furniture comprising of 74 legs. stool of 3 legs and chairs of 4 legs. How many chairs and stools did he make"
*February 28, 2012*

**math grade 6**

a carpainter made 20 pieces of furniture comprising of 74 legs. stool of 3 legs and chairs of 4 legs. How many chairs and stools did he make.
*February 28, 2012*

**physic**

A rowboat crosses a river with a velocity of 3.42 mi/h at an angle 62.5° north of west relative to the water. The river is 0.610 mi wide and carries an eastward current of 1.25 mi/h. How far upstream is the boat when it reaches the opposite shore?
*February 26, 2012*

**Chemistry/Calorimetry**

You buy coffee (200.0 ml) served in a styrofoam cup. You are up late working in a chemistry lab, and want to drink the coffee right away, but at 95.0 degrees C, it is too hot to drink. You like the temperature of your coffee to be 79.0 ± 1.0 degrees C. You decide that ...
*February 23, 2012*

**early childhood**

evolutionary psychology and behavior genetics: watson
*February 23, 2012*

**Physics**

An astronaut is inside a rocket that is blasting off vertically from the launch pad. You want this rocket to reach the speed of sound (331 m/s) as quickly as possible, but you also do not want the astronaut to black out. Medical tests have shown that astronauts are in danger ...
*February 22, 2012*

**Chem**

Ohhh yeah i got it already. Thanks.
*February 18, 2012*

**Chem**

I got it! Thanks for the help...both of you :)
*February 18, 2012*

**Chem**

A solution is made by dissolving 0.584 mol of nonelectrolyte solute in 883 g of benzene. Calculate the freezing point and boiling point of the solution. Tf=? Tb=? I got Tf as 3.39 degrees Celsius I got Tb as 1.67 degrees Celsius It marked me wrong and said "You have given...
*February 18, 2012*

**Chemistry**

Thanks sooo much DrBob222! And I'm glad to help kylie :D
*February 18, 2012*

**Chemistry**

Sorry here are the data: Values at 20 degrees Celcius ethanol : density (g/mL)= 0.789/ vapor pressure (torr)= 43.9 water: density (g/mL) =0.998/ vapor pressure (torr)= 17.5 I' m still confused on what you are telling me to do :( Can u please clarify...
*February 18, 2012*

**math**

A company produces three types of color TVs: Models X, Y and Z. Each model X requires 2 hours of electronic work and 2 hours of assembly work. Each Y model requires 1 hour of electronic work and 3 hours of assembly work. Each model Z requires 3 hours of electronic work and 2 ...
*February 18, 2012*

**physics**

A baseball is thrown horizontally from a height of 12.00 m above the ground with a speed of 25.5 m/s. Where is the ball after 0.80 s have elapsed? The ball is a horizontal distance of m from the launch point.
*February 17, 2012*

**chemistry**

a bird is flying around the world at a rate of 88ft/sec,how many days will it take to complete this journey?
*February 14, 2012*

**General Physics II**

___A __/__\ B/____\C radius (each side of this equilateral triangle) 0.5 m Three point charges are located at the corners of an equilateral triangle as in the figure below. Find the magnitude and direction (counterclockwise from the +x-axis of the net electric force on the 0....
*February 11, 2012*

**Chemistry**

I am still having trouble as well...
*February 10, 2012*

**Chemistry**

Do I use the 293,000 j or 293 kj?
*February 10, 2012*

**Chemistry**

If the heat from burning 5.800 g of C6H6 is added to 5691 g of water at 21 °C, what is the final temperature of the water? 2C6H6(l) +15O2 (g)----> 12CO2(g)+6H2O(l) +6542
*February 10, 2012*

**Chemistry**

The density of liquid "A" is 1.80gm/ml, liquid "B" is 1.10 gm/ml and liquid "C" is 1.40 gm/ml. If theses liquids are immiscible in each other and a piece of solid with a specific gravity of 0.80 is placed in a container of all these liquids, what ...
*February 7, 2012*

**physics**

Two friends, Al and Jo, have a combined mass of 171 kg. At an ice skating rink they stand close together on skates, at rest and facing each other, with a compressed spring between them. The spring is kept from pushing them apart, because they are holding each other. When they ...
*January 25, 2012*

**Math**

A model rocket is shot straight up from the roof of a school. The height at any time t is approximated by the model h=-t^2+3t+28, where h is the height in meters and t is the time in seconds. When does the rocket hit the ground?
*January 24, 2012*